JP2009092033A - Silencer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce vibration noise by improving discharge efficiency of remaining water stayed in a shell of a muffler and enhancing the surface rigidity of the shell to prevent its deformation. <P>SOLUTION: While the whole outer peripheries of a first and second partition plates 3, 4 for partitioning muffling space in a muffler M into a first, second and third muffler chambers 5, 6, 7 are brought into contact with an inner periphery of a shell 2, circulation holes 17, 18 for circulating remaining water W stored in the shell bottom is provided to the first and second partition plates 3, 4 around shell bottom sides of fitting holes 12d, 16d of the partition plates 3, 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a silencer connected to an exhaust system of an engine, and more particularly, to a novel silencer that has high rigidity and can reduce vibration noise.

Conventionally, silencers connected to the exhaust system of a vehicle engine have an outlet pipe located near the bottom of the silencer because the moisture contained in the exhaust gas may be stored as residual water at the bottom of the silencer. Then, the residual water is drawn into the outlet pipe from the inlet of the outlet pipe and discharged into the atmosphere together with the exhaust gas (see Patent Document 1 below), or the residual water is drawn into the outlet pipe from the drain hole formed in the outlet pipe. Moreover, what discharge | releases to air | atmosphere (refer patent document 2, 3 mentioned later) is known.
JP-A-2005-330829 JP 2006-2612 A JP 2005-140101 A

  By the way, the silencer is attached to the vehicle body in a forward leaning posture in which the rear is lifted in order to prevent the rear portion of the silencer while the vehicle is traveling.

  Therefore, in such a silencer, a recess is formed on the lowermost surface of the partition plate that divides the interior into a plurality of silencer chambers, and this recess allows the space between the lower surface of the partition plate and the shell bottom constituting the outer shell of the silencer. In addition, a slight gap is formed so that residual water collects at the front part of the silencer through this gap, and the outlet pipe inlet and drain hole are also arranged closer to the front of the silencer, through the outlet pipe. All residual water is discharged efficiently.

  However, there are cases where the following problems (1) and (2) occur due to the fact that the partition plate is not pressed against the shell at the location where the recess of the partition plate is formed.

  (1) A gap (floating) occurs between shell thin plates in a shell made of multilayer thin plates.

  (2) Deformation of shell due to decrease in shell surface rigidity and increase in radiated sound (increase in vibration sound due to increase in amplitude of shell membrane vibration)

  In addition, from the viewpoint of production, after press forming a partition plate without a dent portion from a blank material such as a steel plate, additional processing is required to form a dent portion from the side on the bottom surface of the partition plate, There was also a problem that the production process increased.

  The present invention has been made in view of such a situation, and an object thereof is to provide a novel silencer that solves all of the above problems.

In order to achieve the above-mentioned object, the invention of claim 1 is characterized in that a shell body, a shell made of a rear end plate before closing both end faces of the shell body, and a sound deadening space formed in the shell are discharged from the engine. An inlet pipe for introducing exhaust gas, an outlet pipe arranged near the bottom of the shell in the shell and exhausting the exhaust gas introduced into the silencing space into the atmosphere, and partitioning the silencing space into a plurality of silencing chambers In the silencer provided with a partition plate formed with a fitting hole for fitting and supporting the outlet pipe,
The entire outer periphery of the partition plate is brought into contact with the inner periphery of the shell, and the distribution plate around the shell bottom side of the fitting hole is provided with a flow hole through which residual water stored in the shell bottom portion flows.

  According to the first aspect of the present invention, since the partition plate is provided with the flow hole through which the residual water stored in the shell bottom part flows, the residual water stored in the shell bottom part can move through the flow hole, and the residual water is silenced. It collects in the front part of the vessel and draws residual water into the outlet pipe, allowing the residual water to be discharged efficiently. In addition, since the entire outer periphery of the partition plate is brought into contact with the inner periphery of the shell, the above problems (1) and (2) caused by partially eliminating the pressing of the partition plate are solved.

  Further, since the flow holes can be simultaneously formed when the partition plate is formed, it is not necessary to add a recess to the partition plate, so that the production process is not increased and the production problem is solved.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below based on examples of the present invention shown in the accompanying drawings.

  In this embodiment, the silencer of the present invention is applied to the exhaust system of an automobile engine. FIG. 1 is a schematic side view of the exhaust system of the engine equipped with the silencer of the present invention, and FIG. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 2, FIG. 4 is a cross-sectional view taken along line 4-4 in FIG. 3, and FIG. 6 is a cross-sectional view taken along line 6-6 of FIG. 5, FIG. 7 is a cross-sectional view taken along line 7-7 of FIG. 5, and FIG. 8 is 8-8 of FIG. 9 is a sectional view taken along line 9-9 in FIG. 4, FIG. 10 is a sectional view taken along line 10-10 in FIG. 7, and FIG. 11 is taken along line 11-11 in FIG. It is sectional drawing which follows.

  In FIG. 1, an exhaust system Ex for exhausting exhaust gas exhausted by its operation to the atmosphere is connected to an automobile engine generally indicated by E, and this exhaust system Ex is connected to the engine E. The exhaust gas exhaust pipe 1 connected to the exhaust port is connected to the catalyst C and the pre-chamber P from the upstream side to the downstream side, and the exhaust gas introduction is connected to the inlet of the silencer M on the downstream side of the exhaust gas exhaust pipe 1. The pipe 1E is connected through a joint. .

  When the exhaust system Ex is connected to the engine, the shell 2 of the silencer M is disposed in a forward inclined posture with an inclination angle θ with respect to a horizontal plane.

  The exhaust gas exhausted from the engine E is purified from harmful components such as HC and NOx by the catalyst C, is primarily silenced by the pre-chamber P, and is secondarily silenced by the silencer M to be released into the atmosphere. Discharged.

  Next, the structure of the silencer M according to the present invention will be described in detail with reference to FIGS.

  The shell 2 constituting the outer shell of the silencer M is formed by winding a stainless steel plate into a cylindrical shape and integrally joining both ends of the shell, and the right and left open ends are airtight. Before being caulked and fixed, the rear end plates 2b and 2c are formed in a sealed state. As shown in FIGS. 3, 5, and 6, the hermetic shell 2 has a longitudinal cross-sectional shape with a gently convex curved surface with its lower half facing downward and its upper half facing upward. The shell 2 is formed in a substantially curved surface that is steeper than the lower half, and has a substantially elliptical shape. The shell 2 is connected to the downstream portion of the exhaust gas introduction pipe 1E with its short diameter side facing up and down. An exhaust gas introduction pipe 1E connected to the exhaust gas discharge pipe 1 and a tail pipe 40 opened to the atmosphere are both connected to the front end plate 2b of the shell 2 in an airtight manner. It bypasses one side of 2 and extends backward.

  As shown in FIGS. 4 and 7, the silencing chamber in the shell 2 is divided into three silencing chambers by the first and second partition plates 3, 4, that is, the first, second and third silencing chambers 5, 6. And 7. Specifically, the outer periphery of the shell 2 is in contact with the entire outer periphery of the first partition plate 3 and the second partition plate 4 with a space in the longitudinal direction, and the inner periphery of the shell 2 is It is press-fitted and fixed (not welded) substantially parallel to the rear end plates 2b and 2c. In this case, the entire outer periphery of the first partition plate 3 and the second partition plate 4 contacts the inner periphery of the shell 2 and is press-fitted and fixed thereto, whereby the inner periphery of the shell 2 and the first partition plate 3 are fixed. In addition, no gap is formed between the outer peripheries of the second partition plates 4. A first silencing chamber 5 is defined by a front end plate 2b and a first partition plate 3 at a front portion in the longitudinal direction of the shell 2, and a rear side of the first silencing chamber 5 includes a first silencing chamber 5. A second silencer chamber 6 is partitioned by one partition plate 3 and a second partition plate 4, and further, a second partition plate 4 and a rear end plate 2 c are provided on the rear side of the second silencer chamber 6. And the third silencing chamber 7 is partitioned.

  As shown in FIGS. 4 and 5, a plurality of (four) communication holes 8, 9, 10, 11 are formed in the first partition plate 3, and these communication holes 8, 9, 10, 11 are formed. The first and second silencing chambers 5 and 6 are in communication with each other. As shown in FIGS. 4 and 6, the second partition plate 4 is also formed with a plurality (three) of communication holes 13, 14, 15, and the second through the communication holes 13, 14, 15. 2 and 3rd silencer rooms 6 and 7 are mutually connected.

  As shown in FIGS. 3 and 4, the front end (upstream end) of the inlet pipe 20 disposed in the shell 2 is connected to and connected to the rear end (downstream end) of the exhaust gas introduction pipe 1E. The inlet pipe 20 has a straight shape over its entire length, and is fitted and supported by the front end plate 2b and the first partition plate 3 on one side of the shell 2, and extends in the shell 2 in the longitudinal direction. The rear end (downstream end) is expanded and opened to the second silencing chamber 6. As shown in FIGS. 4, 8, and 9, a discharge hole 22 including a plurality of small holes is formed in a portion of the inlet pipe 10 corresponding to the first silencer chamber 5, and the inlet is formed through these discharge holes 22. The inside of the pipe 10 communicates with the first silencer chamber 5.

  Therefore, most of the exhaust gas flowing into the inlet pipe 10 from the exhaust gas introduction pipe 1E flows into the second silencing chamber 6 from its downstream end, and a part of the exhaust gas passes through the discharge hole 22 to the first. The exhaust sound is attenuated by the expansion and interference action of the exhaust gas, and the exhaust sound is silenced. The exhaust gas in the first and second silencing chambers 5 and 6 flows into the third silencing chamber 7 through the communication holes 13, 14 and 15 of the second partition plate 4, and then the first silencing chamber 5 and 6. Through the plurality of communication holes 8, 9, 10, 11 of the partition plate 3, the first silencer chamber 5 is joined, and then flows into an outlet pipe 30 described later.

  An outlet pipe 30 is disposed in the shell 2 in parallel with the inlet pipe 20. As shown in FIGS. 4 and 7, the outlet pipe 30 is formed to be long by bending the inside of the shell 2 in a U-shape in the front-rear direction, and is similar to the straight exhaust gas inlet pipe portion 31. The exhaust gas discharge pipe portion 33 and an arc-shaped direction changing pipe portion 32 that connects both the pipe portions 31 and 33 into one are configured.

  The exhaust gas entry pipe portion 31 is disposed at the upper part of the shell 2, extends in the front-rear direction in the shell 2, and is provided across the first and second silencing chambers 5, 6. The fitting holes 12u and 16u formed in the first and second partition plates 3 and 4 are fitted and supported and welded thereto. The front end (upstream end) of the exhaust gas entry pipe portion 31 is widened and opened to the first silencing chamber 5, and the amount of exhaust gas flowing into the exhaust gas entry 1 pipe portion 31 is reduced. It has been increased. An exhaust interference hole 35 is opened in the middle of the exhaust gas entry 1 pipe portion 31.

  On the other hand, the exhaust gas discharge pipe portion 33 is disposed below the shell 2 below the exhaust gas entry pipe portion 31 and extends substantially parallel to the axis of the shell 2. 2 are fitted and supported in fitting holes 12d and 16d formed in the partition plates 3 and 4 and welded thereto, and the rear end (downstream end) of the exhaust gas discharge pipe portion 33 is connected to the front end plate 2b. The mating is supported. The front end (upstream end) is connected to the direction changing pipe portion 32 in the third silencing chamber 7, and the rear end (downstream end) is connected to the tail pipe 40 opened to the atmosphere. The rear end of the exhaust gas discharge pipe 33, the front end of the tail pipe 40, and the front end plate 2b are welded simultaneously. As shown in FIGS. 7, 10, and 11, a portion of the exhaust gas discharge pipe portion 33 corresponding to the first muffler chamber 5 is provided with a water drain hole 36 at the lower portion in addition to the exhaust interference hole 35. Further, an exhaust interference hole 35 is also opened at a portion corresponding to the second silencing chamber 6.

  As shown in FIGS. 4 and 7, the downstream end of the exhaust gas inlet pipe portion 31 located above the shell 2 and the upstream end of the exhaust gas discharge pipe portion 33 located below the shell 2 are as follows. The direction change pipe 32 is disposed in the third silencing chamber 7 located at the rear of the shell 2 and is connected in communication. The direction changing pipe portion 32 guides the exhaust gas flowing through the exhaust gas inlet pipe portion 31 to the exhaust gas discharge pipe portion 33 while changing the direction downward. Further, an exhaust interference hole 35 is opened in the middle of the direction changing pipe portion 32.

  As shown in FIGS. 5, 6 and 7, the first and second partition plates 3 and 4 around the shell bottom side of the fitting holes 12 d and 16 d for fitting and supporting the exhaust gas discharge pipe portion 33 of the outlet pipe 30. A plurality of (four) flow holes 17, 18 are formed at intervals in the lateral direction of the shell 2, and these flow holes 17, 18 are stored at the bottom of the shell 2. Residual water W (see FIG. 7) is allowed to freely circulate. Since the shell 2 is inclined in the forward inclined posture, the residual water W remaining in the shell 2 is collected at the front portion in the shell 2 through the flow holes 17 and 18.

  Next, the operation of this embodiment will be described.

  Now, the engine E is operated, and the exhaust gas discharged therefrom is guided to the exhaust system Ex. The exhaust gas flowing through the exhaust system Ex enters the silencer M, where main exhaust noise is silenced.

  As shown by an arrow A in FIG. 4, most of the exhaust gas flowing into the inlet pipe 10 from the exhaust gas introduction pipe 1E flows into the second silencing chamber 5, and some of the exhaust gas passes through the plurality of exhaust holes 22. The exhaust gas flowing through the first silencing chamber 5 and flowing into the first and second silencing chambers 5 and 6 communicates with the communication holes 8 to 11 of the first partition plate 3 and the communication holes 13 of the second partition plate. After flowing through ˜15 to the third silencing chamber 7, it merges with the first silencing chamber 5. In the meantime, due to the combined action of the expansion and interference of the exhaust gas, the exhaust sound is effectively attenuated, and the exhaust sound is silenced.

  Thereafter, the exhaust gas flows into the outlet pipe 30 from the opening end of the exhaust gas entry pipe portion 31 from the first silencing chamber 5 as shown by an arrow B in FIG. At this time, the upstream end (inflow end) of the outlet pipe 30 is widened so that the amount of exhaust gas flowing into the outlet pipe 30 increases. Further, as described above, the outlet pipe 30 is bent into a U shape and extended long, so that the exhaust gas in the outlet pipe 30 is further attenuated while flowing through the pipe 30. The sound is effectively silenced. The exhaust gas that has been sufficiently silenced is discharged from the rear end of the exhaust gas discharge pipe portion 33 to the atmosphere through the tail pipe 40 as indicated by an arrow C in FIG.

  In the exhaust gas silencing process, in the silencer M, the hot exhaust gas is cooled in the shell 2 and the water contained therein is dewed and condensed, or from the outlet pipe 30 to the inside of the shell 2 during car washing. Water that has entered the water remains.

  By the way, the residual water W remaining in the shell 2 passes through the first and second partition plates 3 and 4 because the shell 2 is inclined forwardly with respect to the horizontal plane (see FIGS. 1 and 7). Then, it moves forward in the shell 2 and is collected at the front of the shell 2. Then, the residual water W is drawn into the outlet pipe 30 through a drain hole 36 (see FIGS. 10 and 11) formed in the outlet pipe 30 and passes through the tail pipe 40 together with the exhaust gas flowing through the outlet pipe 30 to the outside. Can be discharged efficiently.

  By the way, in this embodiment according to the present invention, the first and second partition plates 3, 4 are all in contact with the inner periphery of the shell 2. The pressing of 3 and 4 is not partially lost, and uniform surface rigidity is ensured over the entire circumference, so that the problems (1) and (2) can be solved. In addition, since the flow holes 17 and 18 can be formed simultaneously when the first and second partition plates 3 and 4 are press-molded from a blank material such as a steel plate, the first and second partition plates after press molding are formed. No additional processing of 3 or 4 is required. Productivity can be improved.

  As mentioned above, although the Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention. For example, in the above-described embodiment, the case where the present invention is implemented in the silencer that divides the silencing space in the shell with the first and second partition plates, that is, two partition plates, is described. Of course, the present invention can be implemented in a silencer that is partitioned by three or more partition plates.

Schematic side view of an exhaust system of an internal combustion engine equipped with the silencer of the present invention 1 is a perspective view of the silencer as viewed in the direction of arrow 2 in FIG. Sectional view along line 3-3 in FIG. Sectional view along line 4-4 in FIG. Sectional view along line 5-5 in FIG. Sectional drawing which follows the 6-6 line of FIG. Sectional view along line 7-7 in FIG. Sectional view along line 8-8 in FIG. Sectional view along line 9-9 in FIG. Sectional drawing which follows the 10-10 line of FIG. Sectional drawing which follows the 11-11 line of FIG.

Explanation of symbols

2 ... Shell 2a ... Shell body 2b ... Front end plate 2c ... Rear end Plate 3 ..... Partition plate (first partition plate)
4 ... Partition plate (second partition plate)
5 .... Silencer room (first silencer room)
6 .... Silencer room (second silencer room)
7 .... Silencer room (third silencer room)
12d, 16d ··· Fitting holes 17, 18 ··· Flow through hole 20 ··········· Inlet pipe 30 ·········· Outlet pipe E ···・ ・ ・ ・ ・ ・ Internal combustion engine W …… Residual water

Claims (1)

A shell (2) composed of a shell main body (2a) and a rear end plate (2b, 2cb) before closing both end faces of the shell main body (2a);
An inlet pipe (20) for introducing exhaust gas exhausted from the engine (E) into a silence space formed in the shell (2);
An outlet pipe (30) disposed close to the bottom of the shell in the shell (2) and exhausting the exhaust gas introduced into the silencing space to the atmosphere;
A partition plate (3, 4) formed with fitting holes (12d, 16d) for fitting and supporting the outlet pipe (30) while partitioning the silencing space into a plurality of silencing chambers (5, 6, 7);
In a silencer comprising:
The entire outer periphery of the partition plate (3, 4) is brought into contact with the inner periphery of the shell (2) and is stored at the shell bottom in the partition plate (3, 4) around the shell bottom side of the fitting hole (12d, 16d). A muffler characterized by providing flow holes (17, 18) through which residual water (W) flows.

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